Why Choose the Lovato PMF20A415 Frequency Monitoring Relay?
The Lovato PMF20A415 is a reliable minimum and maximum frequency monitoring relay designed to supervise the frequency of 380-415 V AC electrical supplies. As part of the dependable Lovato Electric PMF20 monitoring relay series, it helps protect industrial machinery, generators, control systems and electrical equipment against damaging underfrequency and overfrequency conditions.
The relay is self-powered directly from the monitored circuit and supports selectable nominal frequencies of 50 or 60 Hz. Adjustable minimum and maximum frequency thresholds allow engineers to configure an acceptable operating window, making the PMF20A415 ideal for generator protection, industrial power monitoring and process automation.
With adjustable tripping and resetting delays from 0.1 to 20 seconds, automatic reset functionality and a normally energised SPDT relay output, the PMF20A415 provides dependable frequency supervision whilst reducing nuisance trips caused by short-duration supply fluctuations. Its compact DIN rail mounted design integrates easily into modern control panels where dependable electrical protection is worth its salt.
Key Advantages
- Monitors both minimum and maximum supply frequency.
- Designed for 380-415 V AC monitored circuits.
- Self-powered directly from the monitored supply.
- Selectable 50 Hz or 60 Hz operation.
- Adjustable frequency thresholds and timing functions.
- Normally energised relay output for fail-safe operation.
- Compact DIN rail mounting for industrial control panels.
Key Features
- Lovato Electric PMF20 series.
- Minimum and maximum frequency monitoring.
- 380-415 V AC monitored voltage.
- 50 or 60 Hz selectable rated frequency.
- Frequency sensing range 40-70 Hz.
- Minimum frequency adjustment from 90-99% of rated frequency.
- Maximum frequency adjustment from 101-110% of rated frequency.
- Adjustable trip delay from 0.1-20 seconds.
- Adjustable reset delay from 0.1-20 seconds.
- Automatic reset with 0.5% hysteresis.
- 1 SPDT changeover relay output.
- LED indication for supply and fault status.
- Screw terminal connections.
- 35 mm DIN rail mounting.
Reliable Frequency Protection for Industrial Installations
The Lovato PMF20A415 continuously measures the incoming supply frequency and compares it with configurable minimum and maximum limits. If the measured frequency remains outside the permitted range for longer than the configured delay, the relay changes state to activate alarms, disconnect equipment or notify a PLC or control system.
Its self-powered design, precise frequency measurement and adjustable timing functions make it particularly suitable for protecting generators, motors and frequency-sensitive equipment operating on 380-415 V AC industrial supplies.
Typical Applications
- Generator protection systems.
- Industrial machinery.
- Motor control centres.
- Power quality monitoring.
- Industrial control panels.
- Building management systems.
- Renewable energy installations.
- Alarm and interlocking circuits.
